You can get syntax help for the various levels of the modify command.
f bbo6acr,help
F bbo6acr,HELP BBOO0178I THE COMMAND MODIFY MAY BE FOLLOWED BY ONE OF THE FOLLOWING KEYWORDS: BBOO0179I CANCEL - CANCEL THIS CONTROL REGION BBOO0179I TRACEALL - SET OVERALL TRACE LEVEL BBOO0179I TRACEBASIC - SET BASIC TRACE COMPONENTS BBOO0179I TRACEDETAIL - SET DETAILED TRACE COMPONENTS BBOO0179I TRACESPECIFIC - SET SPECIFIC TRACE POINTS BBOO0179I TRACEINIT - RESET TO INITIAL TRACE SETTINGS BBOO0179I TRACENONE - TURN OFF ALL TRACING BBOO0179I TRACETOSYSPRINT - SEND TRACE OUTPUT TO SYSPRINT (YES/NO) BBOO0179I TRACETOTRCFILE - SEND TRACE OUTPUT TO TRCFILE DD CARD (YES/NO) BBOO0179I DISPLAY - DISPLAY STATUS BBOO0179I TRACE_EXCLUDE_SPECIFIC - EXCLUDE SPECIFIC TRACE POINTS BBOO0179I TRACEJAVA - SET JAVA TRACE OPTIONS
f bbo6acr,display,help
F bbo6acr,DISPLAY,HELP BBOO0178I THE COMMAND DISPLAY, MAY BE FOLLOWED BY ONE OF THE FOLLOWING KEYWORDS: BBOO0179I SERVERS - DISPLAY ACTIVE CONTROL REGIONS BBOO0179I SERVANTS - DISPLAY SERVANT PROCESSES OWNED BY THIS CONTROL PROCESS BBOO0179I SESSIONS - DISPLAY INFORMATION ABOUT COMMUNICATIONS SESSIONS BBOO0179I TRACE - DISPLAY INFORMATION ABOUT TRACE SETTINGS BBOO0179I JVMHEAP - DISPLAY JVM HEAP STATISTICS BBOO0188I END OF OUTPUT FOR COMMAND DISPLAY,HELP
f bbo6acr,display,sessions,help
F bbo6acr,DISPLAY,SESSIONS,HELP BBOO0178I THE COMMAND DISPLAY,SESSIONS, MAY BE FOLLOWED BY ONE OF THE FOLLOWING KEYWORDS: BBOO0179I LISTENERS - DISPLAY LISTENER INFORMATION BBOO0179I SERVER - DISPLAY SERVER SESSION INFORMATION BBOO0188I END OF OUTPUT FOR COMMAND DISPLAY,SESSIONS,HELP
f bbos001,timeoutdumpactionsession=help
f bbos001,TIMEOUTDUMPACTIONSESSION=HELP BBOO0178I THE COMMAND MODIFY TIMEOUTDUMPACTIONSESSION= MAY BE FOLLOWED BY ONE OF the FOLLOWING KEYWORDS: BBOO0179I SVCDUMP - SVC DUMP BBOO0179I JAVACORE - JAVA CORE DUMP BBOO0179I NONE - NO DUMP